A mercapto functionalized magnetic Zr-MOF by solvent-assisted ligand exchange for Hg²⁺ removal from water

Abstract

A facile preparation of magnetic MOF composites with flexible mercapto group pendants in their pores is realized through solvent-assisted ligand exchange (SALE) under mild conditions in water, and terephthalate in UIO-66 is replaced with mercaptoacetic acid (MAA).

Highly Effective Removal of Metal Cyanide Complexes and Recovery of Palladium Using Quaternary-Ammonium-Functionalized MOFs

“…In the last few years, metal–organic frameworks (MOFs) have attracted significant attention for the removal of contaminants because of their high porosity, large surface area, thermal or chemical stability, hydrophilic–lipophilic matrix, low value, and facile modification [ 13 , 14 ]. Specific functional groups can be introduced into the MOF matrix during synthesis to alter their sorption properties because of the combination of a highly ordered porous structure and various binding groups.…”

Performance of metal–organic frameworks for the adsorptive removal of potentially toxic elements in a water system: a critical review

“…18 This has been well documented for Pb(II), Cd(II), and Hg(II), as well as for Cr(VI) and As(V). 137,168,144 Diffusion is a physical mechanism that governs the adsorption of PTEs by MOFs where data modeling shows the process to reect the intra-particle diffusion equation. 137 It should be noted that the adsorption capacity of a MOF is inuenced by many factors of both the adsorbent and adsorbate.…”

Goal‐Directed Design of Metal–Organic Frameworks for HgII and PbII Adsorption from Aqueous Solutions

“…[40] In as tudy by Huang et al,t erephthalate in UiO-66w as replaced with mercaptoacetic acid and its free sulfur succeeded in adsorbing mercury ions and adsorbed 282 mg g À1 in 20 min, whereas the direct use of the mercaptoacetic acid ligand was not possible to provide the structure. [41] HKUST-1, which is known due to the existence of unsaturated metal site, was also modified post-synthesis by Qiu et al Significantly,t he thiol-functionalized [Cu 3 (BTC) 2 ] n exhibited remarkably high adsorptiona ffinity and capacity (714.29mgg À1 )f or Hg 2 + adsorp-tion from water,w hereas the unfunctionalized HKUST-1 showedn oa dsorption of Hg 2 + under the same condition ( Figure 5). [27] In another study,D ong et al,u sed catalytic carbon-carbon bond-forming reactions through post-synthetic modification to put the thiol group on Cr-Mil-101 and to apply the structure toward Hg II and Pb II adsorption.…”